“It sometimes happens that the Lord leaves an already matured righteous one on earth for a time.  This is done so that the person might bear witness to eternity before men.  The person is already sufficiently mature, and is already living life eternal here on earth, but the Lord keeps him alive so that through him, someone might be brought to God.   Here we can see that everything the Lord does is according to His will. “

(Fr Daniel Sysoyev+, ‘Instructions to Immortals’)